Final answer:
In the described scenario, no too many players infraction occurs because the retiring player did not engage in play and the replacement player's involvement was within the legal limits. Proper timing and location of the player change allowed for a lawful transformation of a 2-1 break into a 2-2 situation.
Step-by-step explanation:
The situation you described does not constitute a too many players infraction. In ice hockey, as per the standard rules of various leagues including the NHL, a too many players penalty is called when a team has more than the allowable number of players on the ice actively involved in the play. Since the retiring player from Team A was in the vicinity of the players' bench and made no attempt to play the puck or body check an opponent, and provided that the time overlap between players was within the allowable limits (usually a few seconds), this scenario is considered a legal line change.
For the replacement player engaging immediately in play, as long as they enter the ice at their team's defensive side of the center red line when their team does not have possession of the puck, no infraction is committed when they engage in play and change the dynamic of the break. Thus, the change from a 2-1 to a 2-2 situation as a result of a well-timed player change is within the rules, given that only the appropriate number of players are involved in the play at any given time.